Hints for massif-visualizer in main

Hints

• asv-screenshot-media-url-not-secure
  org.kde.massif-visualizer.appdata.xml:258 - http://milianw.de/files/massif-visualizer/allocators.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.
• asv-cid-contains-hyphen
  org.kde.massif-visualizer.appdata.xml:3 - org.kde.massif-visualizer.desktop
  The component ID contains a hyphen/minus. Using a hyphen is strongly discouraged, to improve interoperability with other tools such as D-Bus. A good option is to replace any hyphens with underscores (`_`).
• asv-screenshot-media-url-not-secure
  org.kde.massif-visualizer.appdata.xml:234 - http://milianw.de/files/massif-visualizer/callgraph.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.